Compact version using lambda function: void foo() { static bool once = [](){ cout << “once” << endl; return true; } (); cout << “foo” << endl; } Code within lambda function is executed only once, when the static variable is initialized to the return value of lambda function. It should be thread-safe as long … Read more
Because variables are only defined in the scope in which they are declared: package main import “fmt” func main() { a := 1 fmt.Println(a) { a := 2 fmt.Println(a) } fmt.Println(a) } go play The difference between = and := is that = is just assignment and := is syntax for variable declaration and assigment … Read more
As of Delphi 4, Delphi supports dynamic arrays. You can modify their sizes at run time and they will retain the data you stored in other elements at the old size. They can hold elements of any homogeneous type, including records and other arrays. You can declare a dynamic array the same as you declare … Read more
You need to declare x as a global variable in every scope (i.e. function/workspace) that you want it to be shared across. So, you need to write test1 as: function test1() global x; x = 5; end
Here is the document about it You’ll have access to anything within a class or protocol that’s marked with the @objc attribute as long as it’s compatible with Objective-C. This excludes Swift-only features such as those listed here: Generics Tuples Enumerations defined in Swift Structures defined in Swift Top-level functions defined in Swift Global variables … Read more
2016-05-06: New example using ES6-style modules The static $inject array and constructor remain unchanged from the previous example. The only change is to split the classes into multiple files and use ES6 modules to pull in the class definitions. /lib/HelloService.ts: export class HelloService { public getWelcomeMessage():String { return “Hello from HelloService”; } } /lib/AnotherService.ts: import … Read more
In C99, 6.7.8/3: The type of the entity to be initialized shall be an array of unknown size or an object type that is not a variable length array type. 6.6/2: A constant expression can be evaluated during translation rather than runtime 6.6/6: An integer constant expression shall have integer type and shall only have … Read more
This happens because you are using immutable values (ints and None), and importing variables is like passing things by value, not passing things by reference. If you made global_mod.x a list, and manipulated its first element, it would work as you expect. When you do from global_mod import x, you are creating a name x … Read more
Use a QML Singleton. Please reference “Approach 2” on this page — The ugly QTBUG-34418 comments are mine. These are the pieces you need: Style.qml pragma Singleton import QtQuick 2.0 QtObject { property color mainbg: ‘red’ } qmldir This file must be in the same folder as the singleton .qml file (Style.qml in our example) … Read more
It wouldn’t. The two fundamental issues with global variables is simply cluttering the namespace, and the fact that “no one” has “control” over them (thus the potential collisions and conflict with multiple threads). The “globals are bad”, like pretty much every other computer programming idiom is a guideline, not a hard and fast rule. When … Read more